Original matching K98 rifles are a rather rare commodity here in Canada. All of the WWII veterans I've spoken to about the subject have explained that they were not officially allowed to bring firearms home... so a lot of neat stuff ended up in the bottom of Halifax Harbor...
That said, you can sometimes get lucky and find something that either the MP's missed or was brought up from the United States after the fact. The odds aren't in your favour though... That is why these rifles tend to be very pricey when they are made available.
If you simply want an original and aren't too concerned about paying a premium, you can certainly import one from the United States, but with our dollar where it is, it won't be cheap.
As far as finding one in Canada goes, a lot of it is just luck, but I'd suggest starting an ad in the EE and perhaps posting WTB ads at your range or in your community. It's amazing what you can find tucked away in old collections.
- Chris